* Formal: The scoundrel stole the family jewels and escaped into the night, leaving the family devastated.
* Informal: He's such a scoundrel, always flirting with other women even though he has a girlfriend.
* Humorous: My cat is a real scoundrel, stealing my socks and hiding them under the couch.
* Literary: The scoundrel's charming facade hid a heart of darkness, capable of great cruelty.
Let me know if you'd like more examples or a specific kind of sentence!